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Lease Commitments - Schedule of Rent Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
PNMR      
Operating lease expense [Line Items]      
Operating lease expense $ 37,959 $ 35,972 $ 37,432
Public Service Company of New Mexico      
Operating lease expense [Line Items]      
Operating lease expense 33,085 31,817 32,843
Texas-New Mexico Power Company      
Operating lease expense [Line Items]      
Operating lease expense $ 4,351 $ 3,570 $ 3,748